Tool grinding machine



Dec. 11, 1951 A. M. KROCZEK 0 1 TOOL GRINDING MACHINE Filed July 7, 1,947- 4 Sheets-Sheet 1 INVENTOR.

Dec. 11, 1951 A. M. KROCZEK TOOL GRINDJg NG MACHINE 4 Sheets-Sheet 2 Filed July 7, 1947 Dec. 11, 1951 K ZEK 2,578,309

TOOL GRINDING MACHINE 'Filed July 7, 1947 4 Sheets-Sheet 5 WW INVENTOR. 59 84 $22272 flfifrocje/t,

a? BY Dec. 11, 1951 ocz K 2,578,309

TboL GRINDING MACHINE Filed July 7. 1947 4 Sheets-Sheet 4 66 l* 67 7 I A J6 9/ a? g {F 97 7 W 1 J I n 12 a 66 INVENTOR.

Patented Dec. 11, 1951 UNITED stares PATENT orrics TOOL GRINDING MACHINE Anton M. Kroczek, Chicago, 111.

Application July '7, 1947, Serial No. 759,343

2 Claims.

The present invention relates to the tool grinding machines and has for its main object the provision of a machine for grinding most delicate instruments such as dental or medical. A still further object of the present invention is the provision in a tool grinding machine of a plurality of rougher and finer adjustments whereby a tool may be positioned at a predetermined and precise angle with relation to the grinding wheel.

A still further object of the present invention is the provision in a tool grinding machine of suitable markers or indicators in connection with the tool adjusting means for predetermining the exact angle at which a tool is held with relation to the grinding wheel for permitting duplication of grinding operation on a plurality of given tools in order to effect substantially identical operative ends in all of them.

Another object of the present invention is the provision in a tool grinding machine of effective means for shifting the grinding Wheel support to or away from the tool support.

With the above general objects in view and others that will appear as the invention is better understood, the same consists in the novel con- 'struction, combination and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawings and pointed out in the appended claims.

In the drawings forming a part of this application and in which like designating characters refer to corresponding parts throughout the several views;

Fig. '7 is a cross-sectional view on line 1- of Fig. 5;

Fig. 81s a side elevational view, showing a tool supporting member and a grinding wheel, each of a modified construction;

Fig.9 is a vertical cross-sectional view through "the hub of the tool supporting member, illustrated in Fig. 8, in cooperation with a supporting post;

Fig. 10 is a vertical cross-sectional view through a post which supports a tool supporting member:

Fig. 11 shows a vertical cross-sectional view through a shaft cooperating with the grinding wheel supporting member, with a grinding wheel of a modified construction in an operative position therewith; and

Fig. 12 is an enlarged fragmentary cross-sectional view on line 12-42 of Fig. 8.

Referring to the present drawings in detail there is shown therein a housing l3 having its upper end open, and provided at a pair of opposed side walls, and adjacent the upper ends thereof, with flanges hi, the outer faces of which are at an incline. Positioned upon the upper end of said housing iii is carriage plate l5, provided at a pair of opposed edges with downwardly depending flanges iii, the inner walls of the latter being tapered for engaging the inclined faces of flanges Hi, for preventing the disengagement of carriage plate !5 from housing it in a vertical direction, but for permitting sliding movement of said carriage plate transversely of housing I3 and in a longitudinal direction with relation to Rigidly aiiixed by its upper end to carriage plate 15, and partially extending therefrom, is electric motor ii, the body portion of which downwardly depends from said carriage plate 15 and is enclosed within housing [3. Electric wires (not shown) lead from said motor I? to switch i8, the latter mounted within the front wall of the housing, by means of which said motor I! may be set in operation or stopped.

Rigidly affixed to one flange 18, and downwardly depending therefrom is a pair of bearings l9, within which threaded shaft 2%] is supported for free movement therewithin. Another bearing 2 I, mounted upon the adjacent side wall of housing [3, is positioned intermediately of said bearings i9. Said bearing 25 is in a threaded engagement with shaft 26]. Said shaft 23, at its rear end is provided with a stop 22 threaded on one end of shaft 20 for engagement with the adjacent bearing is. Shoulder 23, adjacent the front end of shaft 20 provides another stop which is in contact with the other bearing H9. The front end of said shaft 26 is provided with an integrally formed knurled knob 24, by means of which said shaft 20 may be rotated.

Due to the rigid longitudinal connection of shaft 2.! with bearings [9, by means of stops 22 and 23, and by virtue of threaded connection thereof with bearing'iii, on rotation of said shaft 28 carriage plate It is caused to shift in one or tric bore 35 to receive said shaft 38.

an opposite direction, depending on the direction to which shaft has been rotated by means of knob 24.

Integrally formed with the housing of motor I! is an upwardl projecting stud 25, through which shaft 26 projects, and which shaft is driven by motor l'i. supportable upon said stud is an annular plate 21, from which a concentric boss 28 upwardly projects, both said plate 21 and boss 28 are insertable over said shaft 25 in a concentric relation. G-rinding wheel 29, made of an abrasive material is insertable over said boss 28 and rests upon plate 2?, by which the former is supported. Clamping plate 30 is placed over said grinding wheel 29, for maintaining the same in a clamped position between plates 21 and 30. The upper end of boss 28 is threaded for receiving in a threaded engagement knob 3|, by means of which plates 2? and 35, with grinding wheel 29 interposed therebetween, are maintained in a mutually clamped relation.

Integrally formed with boss 28, and upwardly projecting therefrom is chuck 32, which is of a reduced diameter, and which includes a plurality of outwardly threaded tapering tines, through which shaft 25 extends. Screw 33 threadedly engages chuck 32 and compresses the tines thereof toward shaft 28 for effecting a strong frictional engagement between chuck 32 and said shaft 26, for rigidly engaging grinding wheel 29 with said shaft 25. By virtue of this arrangement when shaft 25 rotates the grinding wheel 29 rotates therewith.

A modified form of grinding wheel is illustrated in Fig. 8, and which consists of a cylindrical block 34, is provided on its periphery with a plurality of grooves 35, within any one of which the end of a tool may be inserted for grinding. Of course said block 34 is made of an abrasive material. In a concentric relation with said block 34 is a hollow shaft 36 within which motor shaft 26 is frictionally held. When the wheel of the type shown in Fig. 8 is used, the wheel illustrated in Figs. 3, 4 and 5 may be removed from shaft 25.

A modified grinding wheel 3? is shown in Fig. 11. The same is of a comparativel small diameter, and has shaft 38 insertable within motor shaft 26, the latter being provided with a concen' Screw 33 is provided with a corresponding bore 46 through which said shaft 38 may be inserted, and said grinding wheel 3'! may be optionally used while wheel 29 is in an operative position upon shaft 25 or removed therefrom.

Rigidly afiixed to the rear wall of housing l3 is bracket M, which supports in a vertical direction split sleeve 42, which has a pair of rearwardly extending arms 43, one on each side of the split for receiving in a threaded engagement screw 44, operable by knob 45, for the purpose of tightening or loosening arms 43, and thereby of disengageably supporting hollow, cylindrical post 46, the latter receivable within said sleeve 42 for vertical adjustment.

Inserted upon post 46 is split collar 4!, which may be vertically adjusted upon post 45 by means of engaging screw 48 and its operable knob 49. Said collar 47, when rigidly affixed to post 46 by means of screw 48, constitute means for limiting the downward shifting movement of said post 46 within sleeve 42, and thereby predetermining the downward shifting movement of tool adjusting and supporting elements hereinafter described.

Set upon post 48 for sliding movement thereon is collar 50 which is split intermediately of a pair by operation of knob 65.

of laterally extending arms 5| for reception of screw 52 operable by means of knob 53, whereby the frictional pressure of said collar 55 on post 46 may be regulated. Positioned within post 45 (see Fig. 10) is piston 54 for free vertical sliding movement therewithin. A pair of screws 55, passed through longitudinal slot 58 made in post 416, and rigidly engaging collar 5!] and piston 54 connect the two. Positioned in a coaxial relation with post 48 is screw 5?, which is passed through a threaded bore in piston 54 for threadedly engaging the latter. In frictional engagement with the upper end of post 48 is stopper 58 through which said screw 5! passes, the portion of the screw within said stopper 58 being smooth and not threaded for permitting free rotary movement of the former within the latter. Screw 57 is provided with an integrally formed or rigidly attached flange 59 which is countersunk within the upper end of stopper 53. Apertured cap 66, welded or soldered to the upper end of post 46 overlies the upper end of stopper 58 and flange 59. Screw 57 passes through said cap 6!]. Flange 59, being interposed between stopper 58 and cap 68, prevents longitudinal movement of screw 51 with relation to post 46. Knob 6|, rigidly engaging the upper end of screw 51, constitutes means whereby screw 57 maybe rotated in either direction. By virtue of this construction, on rotation of screw 57 collar 55 will be caused to shift vertically upon post 46 as piston 54 is actuated by screw Bl, screws 55 being within slot 55 permit upright sliding movement of collar 53, but prevent rotary movement thereof upon post 46.

Rigidly affixed to collar 50 is bracket 62, laterally extending from said collar 50 and in a parallel relation with bracket 4|. Affixed to the outer end of said bracket 52 is split sleeve 85, which is in a horizontal position and overhangs carriage plate l5. Adjacent its split said sleeve 63 is provided with a pair of arms 54 receiving screw 65 operable by knob 85. Receivable within said sleeve 53 is rod 61, which is longitudinally slidable within sleeve 63 on loosening screw 65 The upper portion of sleeve 63, adjacent one end thereof, is provided with an arcuate flange 68, the end face whereof is provided with marker 89. One end of said rod 67 is provided with a disengageable flange '10, which, when disengaged, permits insertion upon said rod 67 of cylindrical member ll. Said cylindrical member "H on its inner periphery is provided with tooth 12 which enters key way I3 made in said rod 61 in its end adjacent flange 10. The

inner end of said cylindrical member ll has an integrally formed flange 74 with a plurality of lines '15 made on its face for indicating the degrees of rotation to which said cylindrical I member ll and rod 61 have been subjected.

From the hereinabove description it will be seen that rod 61 may be longitudinally adjusted within sleeve 63. When said rod 6'! is shifted in the direction which causes the approach of flange 10 towards said sleeve H, tooth I2 rides within key way 13 thereby preventing the transverse dislocation of cylindrical member II with relation to rod 61. When however rod 6'! is rotatably adjusted, cylindrical member H with flange 14 bodily rotates with said rod 67, the lines 75 with reference to marker 69 provide means for reading the degrees of rotation of said rod 61 in either direction.

5 recess therebetween made-longitudinally of said rod 6-1, for receiving therewithin wheel 11. Screw 18, operable by knob 19, passes through said wheel H, and by virtue of its threaded engagement with the bulge adjacent the free end of said screw clamps said wheel 11 between said bulges 76, for the purpose of maintaining said wheel H- in its rotatably adjusted position within said rod. 61. The periphery of said wheel 11 is provided with a plurality of lines 89 for indicating the degrees to which said wheel 11 has been rotatably adjusted. Lip 8|, laterally extending from rod 61, at the base of the recess within which wheel 11 is positioned, provides a marker for facilitating reading the degrees as lines 89 come in register with the free end of said lip 8|. Said lip 8| has an arcuate formation corresponding to the peripheral arc of wheel '51, thereby permitting said lip 81' to ride upon the periphery of saidwheel I! as the same is turned.

Rigidly afiixed to said wheel H at a point adjacent its periphery is sleeve 82, provided at one of its ends with shoulder 83. Receivable within said sleeve 82 is tubular member 84, one end of which has an outwardly extended flange 85. Said end of said member 84 is recessed-as at 86 for defining a pair of clamping jaws 81, one of which is engaged by screw 88. Flange 85 provides a shoulder which limits further shifting movement of sleeve 82 upon tubular member 84.

The outer end of said tubular member 84 extends beyond the outer termination of said sleeve 82, and beyond shoulder 83, and is threaded for being threadedly engaged by outwardly knurled ring 89,. By virtue of this construction said tubular member 84 is rigidly aifixed to said sleeve 82, so that the entire assembly may be angularly shifted as said wheel 11 is turned. With it shifts tool 99 receivable within tubular member 84. Said tool may be longitudinally adjusted and clamped within jaws 8'! when screw 88 is tightened thereagainst.

From the hereinabove description it will be readily seen that the tool supporting elements, including rod 61 and sleeve 82 may be vertically adjusted toward or away from grinding wheel 29 or 31, as the case may be by rotating screw 51 for shifting collar upon post 46. The angular adjustment of tool 90 transversely of rod 6-! is effected by turning said rod 67 into one or the opposite direction on loosening frictional engagement therewith of sleeve 63 when screw is released by turning knob 88. The angular adjustment of tool 90 in a longitudinal direction with relation to rod 61, or on a plane which is substantially at ninety degrees with relation to the plane of movement of said tool 99 last hereinabove mentioned, is effected by turning sleeve 82 with rotary shifting movement of wheel T! when screw 78 is turned by operating knob 19. The extent of rotary shifting of rod 6'! is indicated by marker 69 in cooperation with degree lines 15, while the extent of angular adjustment of sleeve 82 is indicated by the extent of rotary shifting movement of wheel 1'! as read by degree lines 88 coming in register with the free end of lip 8|. By virtue of this arrangement the grinding by wheel .29 or 3! upon one tool may be duplicated upon the others by setting rod 61 at a predetermined angle of rotation as measured by degree lines 15 and marker 69, and at a. predetermined angle of rotation of wheel 11 as measured by degree lines in cooperation with lip 8 I.

The modified form of a tool supporting element is illustrated in. Fig. 8. There is shown therein wheel 91 with a plurality of radial arms 92 connecting said wheel 9| with hub 93. The latter is set upon post 46 for upright sliding movement thereon. Screw 94 passing said hub 93 engages post 49 for rigid adjustment of said wheel 9 Iv upon said post 46. The use of the modified form of tool supporting element contemplates removal of collar 58 together with the tool supporting element heretofore described.

The above operation is readily accomplished by simply removing screws 55 from piston. 54 and collar 50. Thereupon said collar 59 is removed from post 49 by sliding the same in an upward direction. Wheel 9! is substituted by sliding hub 93 over knob GI and unto post 46.

Wheel 9! on its outer periphery is provided with a plurality of recesses 95 which are in an oblique relation with the longitudinal axis of wheel 9| and at various angular positions with relation thereto. Preferably each recess 95 on transverse cross section corresponds to the transverse con.- tour of the shank of the tool in order that the latter may snugly fit into the recess. Each recess 95 is open along the outer periphery of wheel 9| in order that tool 99 may be bodily received within the recess as the tool is brought towards the wheels periphery and in a longitudinal relation with the recess into which the shank of the tool is to be inserted. Cooperating with each recess is screw 98 having knob 91 and a shoulder 98 at the inner end of knob 91. Some of said screws 98 may be optionally driven transversely of wheel 9:, while others may be set upon the end of said wheel 9| and driven thereinto in a longitudinal direction therewith, as is seen in Fig. 8. Those screws 96 which are positioned in a transverse direction with relation to wheel 91 are in the nearest proximity with their cooperating recesses, in fact the body of the screw skirts one of the horizontal transverse wall of recess 95. By virtue of this arrangement, when the shank of tool is within recess 95, shoulder 98 contacts and bears against the exposed portion of the body thereof for clamping the tool within Wheel 9 I, as is clearly seen in Fig. 12.

Those screws which cooperate with wheel 9! longitudinally thereof have prolonged body portions to enter recess 95 from above and in a longitudinal relation with wheel ill for bearing against the tool by their ends as they enter recesses 95. 1 g 7 By virtue of a definite angular position of tool 99 within any chosen recess 95, the grinding operation upon the end or" one tool may be duplicated upon others by inserting the latter within a recess in which the first tool was positioned. Of course, tool 99 may be longitudinally shifted within any given recess 95 to bring the same towards or away from the grinding wheel. Optionally recesses 95- need not extend fully throughout the entire width of wheel 9i, but may terminate short of one end of wheel SI, and on. such recess 95 is shown in Fig. 8.

Since wheels 29, 34 and 31 are interchangeable with shaft 26, tool supporting wheel 9! may be used in connection with any selected grinding wheel, not necessarily with wheel 34 as shown in Fig. 8. This holds also true in connection with the tool supporting and adjusting element illustrated in Figs. 1, 3 and 5.

Since carriage plate I5 is shiftable to or away from post 46, the grinding wheel carried thereby is brought to the most effective position with relation to the end of the tool to be ground.

This holds particularly true with respect to wheel 34, in which grooves 35 are at the periphery of the wheel. If for instance the point of the tool is set in one of said grooves 35 at a point upon the periphery of wheel 34 which is farthest removed from post 46, and then carriage plate i5 is shifted away from said post 46 by turning screw 26 into a proper direction, varied degrees of pressure by wheel 34 may be exerted upon the contacting end of the tool to impart thereto the most effective, desired and predetermined grinding operation.

Obviously, plate 2'! need not be in contact or supported by stud 25. Boss 28 and chuck 32 may be adjusted vertically upon shaft 26 and aflixed to said shaft at any adjusted position. This Will permit bringing of the grinding wheel 29 to or away from the tool in a vertical direction. If preferred, cap 69 may not be in a rigid engagement with post 46. The same may be soldered or welded to stopper 5%. The latter however should be in a frictional engagement with said post 46, or affixed thereto by a screw. In that latter construction piston 54, screw 51, stopper 58, cap 6.0 and knob 6| may all be removed from post 46 after the removal therefrom of collar 59, and preliminarily to the insertion upon said post 46 of hub 93 and wheel 9|.

From the hereinabove description it will also be seen that collar 4! being adjustable on post 46,

constitutes thereby a means for predetermining the downward shifting movement of post 46, with all tool carrying and adjusting appurtenances supported thereby, said collar 4'. coming in contact with the uper end of sleeve 42 preventing further downward shifting movement of post 45. This arrangement constitutes a means for predetermining the extent of grinding operation of wheel 29 upon the end of tool 90. For example let us suppose that collar 41 was so set upon post 46 as to create a gap therebetween and the upper end of sleeve 42 of one-eighth inch in width, while the end of the tool is already in contact with grinding wheel 29. In this given example it is possible for grinding wheel 29 to grind off one-eighth of an inch in the end of the tool, because when grinding to that extent has already taken place, at that very instance collar 41 will be in contact with the upper end of sleeve 42, thereby preventing further downward shifting movement of post 46, the appurtenances carried thereby and the tool.

Likewise wheel 9| is adjustable vertically upon post 46 by means of hub 93 and screw 94. for bringing wheel 9| and with it tool 90 to or away from the grinding wheel.

In the precision tools and instruments, such as surgical or dental, the edges at the operative end of the tool must be at certain definite angles with relation to the axis of the tool or relative to each other. Thus, various adjustments in the machine are capable of grinding the tool at any predetermined angle either while grinding a new tool or regrinding an old one. Angular adjustments of the tool along several planes, as well as the means for limiting the downward shifting movement of the tool towards the grinding wheel, are capable of work of great precision.

It should also be noted that after adjusting collar 41 to a predetermined distance from sleeve 42, piston 54 may then be brought down to shift tool supporting and adjusting elements until the end of the tool comes in contact with the grinding wheel.

Rod 6'! being longitudinally shiftable within sleeve 63 permits adjustment of the tool on a horizontal plane and transversely of the grinding wheel, thereby permitting setting of the operative point of the tool to be ground nearer or farther awa from the center of the grinding wheel. As the grinding operation progresses flange 14 may be manually grasped and rotatably shifted against the frictional hold of sleeve 63 for shifting rod 67 during the progress of the grinding operation upon the tool, simultaneously noting the degrees of the shift of rod 6! on reference to lines 15 and marker 69.

As an alternative mode of the operation of rod 61, sleeve 63 may be rendered loose upon rod 61 by loosening screw 65 on turning knob 66, with the operative end of tool 96 upon grinding wheel 29 while the grinding operation proceeds. During the progress of the grinding operation, visual observation alone of marker 69 and the shifting of degree indicating lines 15 therealong will appraise cf the sufiiciency of the grinding, at which time motor I! may be stopped on operating switch l8, without the need of manipulating the tool supporting parts while the grinding operation proceeds.

While there is described herein a preferred embodiment of the present invention, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

What I claim as new 1. In a tool grinding machine including a base, a power driven grinding wheel mounted on said base and having its grinding surface disposed substantially in a horizontal plane, a support rigidly secured to said base and projecting vertirally therefrom, means connected between said base and said grinding wheel for moving said grinding wheel linearly toward or away from said support, a substantially hollow sleeve mounted on said support and extending transversely thereof, a rod having a recess extending inwardly from one of its ends forming a pair of opposed jaws, a substantially circular disk having indicia on the periphery thereof, a tool carrying member rigidly secured to said disk, said rod having an extension projecting therefrom toward the periphery of said disk to form indicating means cooperating with said indicia, means extending between said jaws and coacting therewith to clamp said disk in its adjusted position, said rod being slidably and rotatably mounted within said sleeve, a pointer rigidly secured to said sleeve, and an indicia bearing flange connected with said rod for rotation therewith about its longitudinal axis and for movement in the diprojecting vertically therefrom, means maintaining the telescoping sleeves in an adjusted position, means connected between said base and said grinding wheel for moving said grinding wheel in a linear direction toward or away from said telescoping sleeves, an elongated substantially cylindrical member mounted on said support and extending transversely thereof, a tool carrying rod positioned within said member for rotation about its longitudinal axis and for movement in the direction of its longitudinal axis, a

pointer rigidly secured to said sleeve, and an indicia bearing flange keyed to said rod for rotation therewith about its longitudinal axis and for reciprocal sliding movement in the direction of its longitudinal axis, said flange cooperating with said pointer to indicate the degree of rotation of said rod as said grinding Wheel operates on a tool supported by said rod.

ANTON M. KROCZEK.

REFERENCES CITED The following references are of record in the file of this patent:

Number 10 Name Date Passmore July 26, 1892 Armeny July 24, 1894 Marcher Mar. 8, 1904 Stansfield July 26, 1904 Coleman Oct. 24, 1905 Hanson May 18, 1909 Baldwin Oct. 1%, 1913 Artmaier Aug. 24, 1920 Anzelwitz July 19, 1927 Gorton July 25, 1933 Schmidt May 8, 1934 Bausch et a1 Dec. 17, 1935 Kuhle Sept. 1, 1935 Bigelow Dec. 8, 1942 Johnson et a1. Sept. 7, 1943 Lentz Mar. 6, 1951 

